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1993 Fiscal Year Final Research Report Summary

Polymer adsorption on inorganic particles and rheological properties of the dispersions

Research Project

Project/Area Number 03453109
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field 高分子物性・高分子材料(含機械材料)
Research InstitutionMIE UNIVERSITY

Principal Investigator

KAWAGUCHI Masami  Mie University, Faculty of Engineering, Professor, 工学部, 助教授 (30093123)

Project Period (FY) 1991 – 1993
Keywordsinorganic particles / polymer adsorption / rheology / silica suspensions / shear stress / flow curves / storage modulus
Research Abstract

In this study, rheological properties of silica particles dispersed in aqueous solutions of hydroxypropyl methyl cellulose (HPMC) were investigated in combination of adsorption behavior of HPMC on the silica surfaces.
1.For the suspensions of fumed silica particles dispersed in HPMC solution, rheopexy and overshooting were observed in transient shear stress, showing the existence of aggregated structure in the dispersions.
Evidence of the aggregated structures in the silica suspensions was supported by observations of a bomb at low shear rate in plots of the steady-state shear stress against shear rate (flow curves) as well as a second plateau in the frequency dependence of storage modulus. Moreover, partial desorption of HPMC from the silica particles did not reduce the bomb and the second plateau.
2.For the suspensions of colloidal silicas dispersed in HPMC solution, transient shear stress showed no time dependence. The flow curves only indicated shear thinning. The loss modulus was larger than the storage one in the entire range of frequency except for higher frequency, showing liquid-like viscoelastic behavior. The difference in the rheological behavior of the silica suspensions stemmed from the stability of the silica particles : the fumed silicas were aggregated due to their gelling character inwater, whereas the colloidal silicas were electrostatically stable.

  • Research Products

    (14 results)

All Other

All Publications (14 results)

  • [Publications] 穴田幸雄: "Effect of surface geometry on polymer adsorption.3.Competitive adsorption at the θ point" Macromolecules. 25. 6824-6828 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 川口正美: "Polymer adsorption at solid-liquid interfaces" Advances in Colloid and Interface Science. 37. 219-227 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 川口正美: "Rheological Properties of silica suspensions in aqueous cellulose derivatitive solutions" Chemical Engineering Science. 48. 393-400 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 中井康弘: "Transient and Steady-state rheology of silica suspensions in hydroxy propyl(methyl)cellulose solutions" Journal of Chemical Society Faraday Transactions. 89. 2467-2472 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 川口正美: "Kinetics of Competitive adsorption of Polystyrene chains at a porous silica surface" Langmuir. 10. 538-541 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 川口正美: "Effects of Polymer adsorption and desorption on rheological properties of silica suspensions" Colloids and Surfaces. (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 鈴木基之: "Fundamentals of adsorption" 講談社, 801 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S.Anada and M.Kawaguchi: ""Effect of surface geometry on polymer adsorption. 3. Competitive adsorption at the rheta point"" Macromolecules. 25. 6824-6828 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Kawaguchi and A.Takahashi: ""Polymer adsorption at solid-liquid interfaces"" Adv.Colloid, Interface Sci.37. 219-227 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Kawaguchi and Y.Ryo: ""Rheological properties of silica suspensions in aqueous cellulose derivative solutions"" Chem.Eng.Sci.48. 393-400 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.Nakai, Y.Ryo, and M.Kawaguchi: ""Transient and steady-state rheology of silica suspensions in hydroxypropyl(methyl)cellulose solutions"" J.Chem.Soc.Faraday Trans.89. 2467-2472 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Kawaguchi, Y.Sakata, S.Anada, T.Kato, and A.Takahashi: ""Kinetics of competitive adsorption of polystirene chains at porous silica surface"" Langmuir. 10. 538-541 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Kawaguchi: ""Effects of polymer adsorption and desorption on rheological properties of silica suspensions"" Colloids Surfaces. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] N.Kurata, S.Anada, and M.Kawaguchi: "Competitive adsorption of polymer chains at fractal surfaces". Fundamentals of Adsorption, 801 (1993)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1995-03-27  

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